idlestat: Add parameter assertions to intersection()

The function intersection() uses pointer parameters without checking
the validity. Add assert() statements making sure the pointers are
not NULL.

Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org>

Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/idlestat.c b/idlestat.c
index 5d9f12e..7e3ea38 100644
--- a/idlestat.c
+++ b/idlestat.c
@@ -205,6 +205,9 @@ static struct cpuidle_data *intersection(struct cpuidle_data *data1,
 	double begin, end;
 	struct cpuidle_data *data;
 
+	assert(data1 != NULL);
+	assert(data2 != NULL);
+
 	begin = MAX(data1->begin, data2->begin);
 	end = MIN(data1->end, data2->end);